RISC-V: Add StarFive SoC Kconfig option

Add StarFive Kconfig option to select SoC specific and common drivers
required for these SoCs. Select subsystems required to boot so the
required drivers gets enabled by default.
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>

arch/riscv/Kconfig.socs

@@ -19,6 +19,14 @@ config SOC_SIFIVE
 	help
 	  This enables support for SiFive SoC platform hardware.
 
+config SOC_STARFIVE
+	bool "StarFive SoCs"
+	select PINCTRL
+	select RESET_CONTROLLER
+	select SIFIVE_PLIC
+	help
+	  This enables support for StarFive SoC platform hardware.
+
 config SOC_VIRT
 	bool "QEMU Virt Machine"
 	select CLINT_TIMER if RISCV_M_MODE